He shipped and paid USPS to handle the package, provided a tracking number and its his fault USPS incompetently, not only handled the package, failed to update the tracking info at each stop or even find it.... you mail a saw and they lose it... it's your fault?
I ship stuff all the time, 1/2 the time it shows up without ever having the tracking info updated... USPS sucks, but it's still the cheapest shipping around and nobody wants to pay extra for anything. You hear all the time, you get what you pay for.... BS, everybody want's it as cheap as possible! People go out of there way to provided links to cheaper priced stuff, read almost any thread here involving a saw part.
I think companies replace stuff as a way of trying to keep a customer happy. I also think USPS handing it off to UPS is crap!